Display panel or portion thereof with a transitional mixed reality graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with atransitional mixed reality graphical user interface showing a firstimage in a sequence of our design;

FIG. 2 is a front view of a second image in the sequence thereof; and,

FIG. 3 is a front view of a third image in the sequence thereof.

The appearance of the image sequentially transitions between the imagesshown in FIGS. 1-3. The process or period in which one image transitionsinto another forms no part of the claimed design.

The outermost broken line rectangle illustrates a display panel orportion thereof that forms no part of the claimed design. The remainingbroken lines illustrate portions of the graphical user interface or amixed reality environment, and form no part of the claimed design.

CLAIM The ornamental design for a display panel or portion thereof witha transitional mixed reality graphical user interface, as shown anddescribed.